1 Department of Physical Therapy, School of Health Sciences, International University of Health and Welfare, Otawara, Tochigi, Japan.
2 Senior Services Division of Otawara, Otawara, Tochigi, Japan.
3 Department of Physical Therapy, School of Health Sciences at Odawara, International University of Health and Welfare, Odawara, Kanagawa, Japan.
4 Department of Geriatric Medicine, School of Medicine, International University of Health and Welfare, Narita, Chiba, Japan. Electronic address: turanotky@gmail.com.